#-------------------------------------------------------------
#
# (C) Copyright IBM Corp. 2010, 2015
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#-------------------------------------------------------------

# JUnit test class: dml.test.integration.descriptivestats.CategoricalCategoricalTest.java
# command line invocation assuming $CC_HOME is set to the home of the R script
# Rscript $CC_HOME/CategoricalCategorical.R $CC_HOME/in/ $CC_HOME/expected/
args <- commandArgs(TRUE)
options(digits=22)

library("Matrix")

A = readMM(paste(args[1], "A.mtx", sep=""));
B = readMM(paste(args[1], "B.mtx", sep=""));

F = table(A[,1],B[,1]);

# chisq.test returns a list containing statistic, p-value, etc.
cst = chisq.test(F);

# get the chi-squared coefficient from the list
chi_squared = as.numeric(cst[1]);
pValue = as.numeric(cst[3]);

write(pValue, paste(args[2], "PValue", sep=""));

q = min(dim(F));
W = sum(F);
cramers_v = sqrt(chi_squared/(W*(q-1)));

write(cramers_v, paste(args[2], "CramersV", sep=""));

